Sidewall portion of an automobile tire



FIG. 1 is a left side view of a sidewall portion of an automobile tire;

FIG. 2 is a perspective view thereof;

FIG. 3 is a front view thereof; and,

FIG. 4 is a fragmentary enlarged view showing the details of the sidewall portion defined by cross-section with view A—A, B—B, C—C and D—D in FIG. 1 thereof.

Broken lines in the drawing figures show environmental structure only, and form no part of the claimed design. 

The ornamental design for a sidewall portion of an automobile tire, as shown and described. 